drivers/net/phy/micrel.c - kernel/lockdown - Git at Google

 /*
  * drivers/net/phy/micrel.c
  *
  * Driver for Micrel PHYs
  *
  * Author: David J. Choi
  *
  * Copyright (c) 2010-2013 Micrel, Inc.
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  * Support : Micrel Phys:
  *		Giga phys: ksz9021, ksz9031
  *		100/10 Phys : ksz8001, ksz8721, ksz8737, ksz8041
  *			   ksz8021, ksz8031, ksz8051,
  *			   ksz8081, ksz8091,
  *			   ksz8061,
  *		Switch : ksz8873, ksz886x
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/phy.h>
 #include <linux/micrel_phy.h>
 #include <linux/of.h>

 /* Operation Mode Strap Override */
 #define MII_KSZPHY_OMSO				0x16
 #define KSZPHY_OMSO_B_CAST_OFF			(1 << 9)
 #define KSZPHY_OMSO_RMII_OVERRIDE		(1 << 1)
 #define KSZPHY_OMSO_MII_OVERRIDE		(1 << 0)

 /* general Interrupt control/status reg in vendor specific block. */
 #define MII_KSZPHY_INTCS			0x1B
 #define	KSZPHY_INTCS_JABBER			(1 << 15)
 #define	KSZPHY_INTCS_RECEIVE_ERR		(1 << 14)
 #define	KSZPHY_INTCS_PAGE_RECEIVE		(1 << 13)
 #define	KSZPHY_INTCS_PARELLEL			(1 << 12)
 #define	KSZPHY_INTCS_LINK_PARTNER_ACK		(1 << 11)
 #define	KSZPHY_INTCS_LINK_DOWN			(1 << 10)
 #define	KSZPHY_INTCS_REMOTE_FAULT		(1 << 9)
 #define	KSZPHY_INTCS_LINK_UP			(1 << 8)
 #define	KSZPHY_INTCS_ALL			(KSZPHY_INTCS_LINK_UP |\
 						KSZPHY_INTCS_LINK_DOWN)

 /* general PHY control reg in vendor specific block. */
 #define	MII_KSZPHY_CTRL			0x1F
 /* bitmap of PHY register to set interrupt mode */
 #define KSZPHY_CTRL_INT_ACTIVE_HIGH		(1 << 9)
 #define KSZ9021_CTRL_INT_ACTIVE_HIGH		(1 << 14)
 #define KS8737_CTRL_INT_ACTIVE_HIGH		(1 << 14)
 #define KSZ8051_RMII_50MHZ_CLK			(1 << 7)

 /* Write/read to/from extended registers */
 #define MII_KSZPHY_EXTREG                       0x0b
 #define KSZPHY_EXTREG_WRITE                     0x8000

 #define MII_KSZPHY_EXTREG_WRITE                 0x0c
 #define MII_KSZPHY_EXTREG_READ                  0x0d

 /* Extended registers */
 #define MII_KSZPHY_CLK_CONTROL_PAD_SKEW         0x104
 #define MII_KSZPHY_RX_DATA_PAD_SKEW             0x105
 #define MII_KSZPHY_TX_DATA_PAD_SKEW             0x106

 #define PS_TO_REG				200

 static int ksz_config_flags(struct phy_device *phydev)
 {
 	int regval;

 	if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK) {
 		regval = phy_read(phydev, MII_KSZPHY_CTRL);
 		regval |= KSZ8051_RMII_50MHZ_CLK;
 		return phy_write(phydev, MII_KSZPHY_CTRL, regval);
 	}
 	return 0;
 }

 static int kszphy_extended_write(struct phy_device *phydev,
 				u32 regnum, u16 val)
 {
 	phy_write(phydev, MII_KSZPHY_EXTREG, KSZPHY_EXTREG_WRITE | regnum);
 	return phy_write(phydev, MII_KSZPHY_EXTREG_WRITE, val);
 }

 static int kszphy_extended_read(struct phy_device *phydev,
 				u32 regnum)
 {
 	phy_write(phydev, MII_KSZPHY_EXTREG, regnum);
 	return phy_read(phydev, MII_KSZPHY_EXTREG_READ);
 }

 static int kszphy_ack_interrupt(struct phy_device *phydev)
 {
 	/* bit[7..0] int status, which is a read and clear register. */
 	int rc;

 	rc = phy_read(phydev, MII_KSZPHY_INTCS);

 	return (rc < 0) ? rc : 0;
 }

 static int kszphy_set_interrupt(struct phy_device *phydev)
 {
 	int temp;
 	temp = (PHY_INTERRUPT_ENABLED == phydev->interrupts) ?
 		KSZPHY_INTCS_ALL : 0;
 	return phy_write(phydev, MII_KSZPHY_INTCS, temp);
 }

 static int kszphy_config_intr(struct phy_device *phydev)
 {
 	int temp, rc;

 	/* set the interrupt pin active low */
 	temp = phy_read(phydev, MII_KSZPHY_CTRL);
 	temp &= ~KSZPHY_CTRL_INT_ACTIVE_HIGH;
 	phy_write(phydev, MII_KSZPHY_CTRL, temp);
 	rc = kszphy_set_interrupt(phydev);
 	return rc < 0 ? rc : 0;
 }

 static int ksz9021_config_intr(struct phy_device *phydev)
 {
 	int temp, rc;

 	/* set the interrupt pin active low */
 	temp = phy_read(phydev, MII_KSZPHY_CTRL);
 	temp &= ~KSZ9021_CTRL_INT_ACTIVE_HIGH;
 	phy_write(phydev, MII_KSZPHY_CTRL, temp);
 	rc = kszphy_set_interrupt(phydev);
 	return rc < 0 ? rc : 0;
 }

 static int ks8737_config_intr(struct phy_device *phydev)
 {
 	int temp, rc;

 	/* set the interrupt pin active low */
 	temp = phy_read(phydev, MII_KSZPHY_CTRL);
 	temp &= ~KS8737_CTRL_INT_ACTIVE_HIGH;
 	phy_write(phydev, MII_KSZPHY_CTRL, temp);
 	rc = kszphy_set_interrupt(phydev);
 	return rc < 0 ? rc : 0;
 }

 static int kszphy_config_init(struct phy_device *phydev)
 {
 	return 0;
 }

 static int ksz8021_config_init(struct phy_device *phydev)
 {
 	int rc;
 	const u16 val = KSZPHY_OMSO_B_CAST_OFF | KSZPHY_OMSO_RMII_OVERRIDE;
 	phy_write(phydev, MII_KSZPHY_OMSO, val);
 	rc = ksz_config_flags(phydev);
 	return rc < 0 ? rc : 0;
 }

 static int ks8051_config_init(struct phy_device *phydev)
 {
 	int rc;

 	rc = ksz_config_flags(phydev);
 	return rc < 0 ? rc : 0;
 }

 static int ksz9021_load_values_from_of(struct phy_device *phydev,
 				       struct device_node *of_node, u16 reg,
 				       char *field1, char *field2,
 				       char *field3, char *field4)
 {
 	int val1 = -1;
 	int val2 = -2;
 	int val3 = -3;
 	int val4 = -4;
 	int newval;
 	int matches = 0;

 	if (!of_property_read_u32(of_node, field1, &val1))
 		matches++;

 	if (!of_property_read_u32(of_node, field2, &val2))
 		matches++;

 	if (!of_property_read_u32(of_node, field3, &val3))
 		matches++;

 	if (!of_property_read_u32(of_node, field4, &val4))
 		matches++;

 	if (!matches)
 		return 0;

 	if (matches < 4)
 		newval = kszphy_extended_read(phydev, reg);
 	else
 		newval = 0;

 	if (val1 != -1)
 		newval = ((newval & 0xfff0) | ((val1 / PS_TO_REG) & 0xf) << 0);

 	if (val2 != -1)
 		newval = ((newval & 0xff0f) | ((val2 / PS_TO_REG) & 0xf) << 4);

 	if (val3 != -1)
 		newval = ((newval & 0xf0ff) | ((val3 / PS_TO_REG) & 0xf) << 8);

 	if (val4 != -1)
 		newval = ((newval & 0x0fff) | ((val4 / PS_TO_REG) & 0xf) << 12);

 	return kszphy_extended_write(phydev, reg, newval);
 }

 static int ksz9021_config_init(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->dev;
 	struct device_node *of_node = dev->of_node;

 	if (!of_node && dev->parent->of_node)
 		of_node = dev->parent->of_node;

 	if (of_node) {
 		ksz9021_load_values_from_of(phydev, of_node,
 				    MII_KSZPHY_CLK_CONTROL_PAD_SKEW,
 				    "txen-skew-ps", "txc-skew-ps",
 				    "rxdv-skew-ps", "rxc-skew-ps");
 		ksz9021_load_values_from_of(phydev, of_node,
 				    MII_KSZPHY_RX_DATA_PAD_SKEW,
 				    "rxd0-skew-ps", "rxd1-skew-ps",
 				    "rxd2-skew-ps", "rxd3-skew-ps");
 		ksz9021_load_values_from_of(phydev, of_node,
 				    MII_KSZPHY_TX_DATA_PAD_SKEW,
 				    "txd0-skew-ps", "txd1-skew-ps",
 				    "txd2-skew-ps", "txd3-skew-ps");
 	}
 	return 0;
 }

 #define KSZ8873MLL_GLOBAL_CONTROL_4	0x06
 #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX	(1 << 6)
 #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED	(1 << 4)
 static int ksz8873mll_read_status(struct phy_device *phydev)
 {
 	int regval;

 	/* dummy read */
 	regval = phy_read(phydev, KSZ8873MLL_GLOBAL_CONTROL_4);

 	regval = phy_read(phydev, KSZ8873MLL_GLOBAL_CONTROL_4);

 	if (regval & KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX)
 		phydev->duplex = DUPLEX_HALF;
 	else
 		phydev->duplex = DUPLEX_FULL;

 	if (regval & KSZ8873MLL_GLOBAL_CONTROL_4_SPEED)
 		phydev->speed = SPEED_10;
 	else
 		phydev->speed = SPEED_100;

 	phydev->link = 1;
 	phydev->pause = phydev->asym_pause = 0;

 	return 0;
 }

 static int ksz8873mll_config_aneg(struct phy_device *phydev)
 {
 	return 0;
 }

 static struct phy_driver ksphy_driver[] = {
 {
 	.phy_id		= PHY_ID_KS8737,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KS8737",
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= ks8737_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8021,
 	.phy_id_mask	= 0x00ffffff,
 	.name		= "Micrel KSZ8021 or KSZ8031",
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
 			   SUPPORTED_Asym_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= ksz8021_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8031,
 	.phy_id_mask	= 0x00ffffff,
 	.name		= "Micrel KSZ8031",
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
 			   SUPPORTED_Asym_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= ksz8021_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8041,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KSZ8041",
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause
 				| SUPPORTED_Asym_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8041RNLI,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KSZ8041RNLI",
 	.features	= PHY_BASIC_FEATURES |
 			  SUPPORTED_Pause | SUPPORTED_Asym_Pause,
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8051,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KSZ8051",
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause
 				| SUPPORTED_Asym_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= ks8051_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8001,
 	.name		= "Micrel KSZ8001 or KS8721",
 	.phy_id_mask	= 0x00ffffff,
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8081,
 	.name		= "Micrel KSZ8081 or KSZ8091",
 	.phy_id_mask	= 0x00fffff0,
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ8061,
 	.name		= "Micrel KSZ8061",
 	.phy_id_mask	= 0x00fffff0,
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= kszphy_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE,},
 }, {
 	.phy_id		= PHY_ID_KSZ9021,
 	.phy_id_mask	= 0x000ffffe,
 	.name		= "Micrel KSZ9021 Gigabit PHY",
 	.features	= (PHY_GBIT_FEATURES | SUPPORTED_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= ksz9021_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= ksz9021_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE, },
 }, {
 	.phy_id		= PHY_ID_KSZ9031,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KSZ9031 Gigabit PHY",
 	.features	= (PHY_GBIT_FEATURES | SUPPORTED_Pause
 				| SUPPORTED_Asym_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.ack_interrupt	= kszphy_ack_interrupt,
 	.config_intr	= ksz9021_config_intr,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE, },
 }, {
 	.phy_id		= PHY_ID_KSZ8873MLL,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KSZ8873MLL Switch",
 	.features	= (SUPPORTED_Pause | SUPPORTED_Asym_Pause),
 	.flags		= PHY_HAS_MAGICANEG,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= ksz8873mll_config_aneg,
 	.read_status	= ksz8873mll_read_status,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE, },
 }, {
 	.phy_id		= PHY_ID_KSZ886X,
 	.phy_id_mask	= 0x00fffff0,
 	.name		= "Micrel KSZ886X Switch",
 	.features	= (PHY_BASIC_FEATURES | SUPPORTED_Pause),
 	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
 	.config_init	= kszphy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 	.driver		= { .owner = THIS_MODULE, },
 } };

 static int __init ksphy_init(void)
 {
 	return phy_drivers_register(ksphy_driver,
 		ARRAY_SIZE(ksphy_driver));
 }

 static void __exit ksphy_exit(void)
 {
 	phy_drivers_unregister(ksphy_driver,
 		ARRAY_SIZE(ksphy_driver));
 }

 module_init(ksphy_init);
 module_exit(ksphy_exit);

 MODULE_DESCRIPTION("Micrel PHY driver");
 MODULE_AUTHOR("David J. Choi");
 MODULE_LICENSE("GPL");

 static struct mdio_device_id __maybe_unused micrel_tbl[] = {
 	{ PHY_ID_KSZ9021, 0x000ffffe },
 	{ PHY_ID_KSZ9031, 0x00fffff0 },
 	{ PHY_ID_KSZ8001, 0x00ffffff },
 	{ PHY_ID_KS8737, 0x00fffff0 },
 	{ PHY_ID_KSZ8021, 0x00ffffff },
 	{ PHY_ID_KSZ8031, 0x00ffffff },
 	{ PHY_ID_KSZ8041, 0x00fffff0 },
 	{ PHY_ID_KSZ8051, 0x00fffff0 },
 	{ PHY_ID_KSZ8061, 0x00fffff0 },
 	{ PHY_ID_KSZ8081, 0x00fffff0 },
 	{ PHY_ID_KSZ8873MLL, 0x00fffff0 },
 	{ PHY_ID_KSZ886X, 0x00fffff0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(mdio, micrel_tbl);
	/*
	* drivers/net/phy/micrel.c
	*
	* Driver for Micrel PHYs
	*
	* Author: David J. Choi
	*
	* Copyright (c) 2010-2013 Micrel, Inc.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	* Support : Micrel Phys:
	* Giga phys: ksz9021, ksz9031
	* 100/10 Phys : ksz8001, ksz8721, ksz8737, ksz8041
	* ksz8021, ksz8031, ksz8051,
	* ksz8081, ksz8091,
	* ksz8061,
	* Switch : ksz8873, ksz886x
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/phy.h>
	#include <linux/micrel_phy.h>
	#include <linux/of.h>

	/* Operation Mode Strap Override */
	#define MII_KSZPHY_OMSO 0x16
	#define KSZPHY_OMSO_B_CAST_OFF (1 << 9)
	#define KSZPHY_OMSO_RMII_OVERRIDE (1 << 1)
	#define KSZPHY_OMSO_MII_OVERRIDE (1 << 0)

	/* general Interrupt control/status reg in vendor specific block. */
	#define MII_KSZPHY_INTCS 0x1B
	#define KSZPHY_INTCS_JABBER (1 << 15)
	#define KSZPHY_INTCS_RECEIVE_ERR (1 << 14)
	#define KSZPHY_INTCS_PAGE_RECEIVE (1 << 13)
	#define KSZPHY_INTCS_PARELLEL (1 << 12)
	#define KSZPHY_INTCS_LINK_PARTNER_ACK (1 << 11)
	#define KSZPHY_INTCS_LINK_DOWN (1 << 10)
	#define KSZPHY_INTCS_REMOTE_FAULT (1 << 9)
	#define KSZPHY_INTCS_LINK_UP (1 << 8)
	#define KSZPHY_INTCS_ALL (KSZPHY_INTCS_LINK_UP \|\
	KSZPHY_INTCS_LINK_DOWN)

	/* general PHY control reg in vendor specific block. */
	#define MII_KSZPHY_CTRL 0x1F
	/* bitmap of PHY register to set interrupt mode */
	#define KSZPHY_CTRL_INT_ACTIVE_HIGH (1 << 9)
	#define KSZ9021_CTRL_INT_ACTIVE_HIGH (1 << 14)
	#define KS8737_CTRL_INT_ACTIVE_HIGH (1 << 14)
	#define KSZ8051_RMII_50MHZ_CLK (1 << 7)

	/* Write/read to/from extended registers */
	#define MII_KSZPHY_EXTREG 0x0b
	#define KSZPHY_EXTREG_WRITE 0x8000

	#define MII_KSZPHY_EXTREG_WRITE 0x0c
	#define MII_KSZPHY_EXTREG_READ 0x0d

	/* Extended registers */
	#define MII_KSZPHY_CLK_CONTROL_PAD_SKEW 0x104
	#define MII_KSZPHY_RX_DATA_PAD_SKEW 0x105
	#define MII_KSZPHY_TX_DATA_PAD_SKEW 0x106

	#define PS_TO_REG 200

	static int ksz_config_flags(struct phy_device *phydev)
	{
	int regval;

	if (phydev->dev_flags & MICREL_PHY_50MHZ_CLK) {
	regval = phy_read(phydev, MII_KSZPHY_CTRL);
	regval \|= KSZ8051_RMII_50MHZ_CLK;
	return phy_write(phydev, MII_KSZPHY_CTRL, regval);
	}
	return 0;
	}

	static int kszphy_extended_write(struct phy_device *phydev,
	u32 regnum, u16 val)
	{
	phy_write(phydev, MII_KSZPHY_EXTREG, KSZPHY_EXTREG_WRITE \| regnum);
	return phy_write(phydev, MII_KSZPHY_EXTREG_WRITE, val);
	}

	static int kszphy_extended_read(struct phy_device *phydev,
	u32 regnum)
	{
	phy_write(phydev, MII_KSZPHY_EXTREG, regnum);
	return phy_read(phydev, MII_KSZPHY_EXTREG_READ);
	}

	static int kszphy_ack_interrupt(struct phy_device *phydev)
	{
	/* bit[7..0] int status, which is a read and clear register. */
	int rc;

	rc = phy_read(phydev, MII_KSZPHY_INTCS);

	return (rc < 0) ? rc : 0;
	}

	static int kszphy_set_interrupt(struct phy_device *phydev)
	{
	int temp;
	temp = (PHY_INTERRUPT_ENABLED == phydev->interrupts) ?
	KSZPHY_INTCS_ALL : 0;
	return phy_write(phydev, MII_KSZPHY_INTCS, temp);
	}

	static int kszphy_config_intr(struct phy_device *phydev)
	{
	int temp, rc;

	/* set the interrupt pin active low */
	temp = phy_read(phydev, MII_KSZPHY_CTRL);
	temp &= ~KSZPHY_CTRL_INT_ACTIVE_HIGH;
	phy_write(phydev, MII_KSZPHY_CTRL, temp);
	rc = kszphy_set_interrupt(phydev);
	return rc < 0 ? rc : 0;
	}

	static int ksz9021_config_intr(struct phy_device *phydev)
	{
	int temp, rc;

	/* set the interrupt pin active low */
	temp = phy_read(phydev, MII_KSZPHY_CTRL);
	temp &= ~KSZ9021_CTRL_INT_ACTIVE_HIGH;
	phy_write(phydev, MII_KSZPHY_CTRL, temp);
	rc = kszphy_set_interrupt(phydev);
	return rc < 0 ? rc : 0;
	}

	static int ks8737_config_intr(struct phy_device *phydev)
	{
	int temp, rc;

	/* set the interrupt pin active low */
	temp = phy_read(phydev, MII_KSZPHY_CTRL);
	temp &= ~KS8737_CTRL_INT_ACTIVE_HIGH;
	phy_write(phydev, MII_KSZPHY_CTRL, temp);
	rc = kszphy_set_interrupt(phydev);
	return rc < 0 ? rc : 0;
	}

	static int kszphy_config_init(struct phy_device *phydev)
	{
	return 0;
	}

	static int ksz8021_config_init(struct phy_device *phydev)
	{
	int rc;
	const u16 val = KSZPHY_OMSO_B_CAST_OFF \| KSZPHY_OMSO_RMII_OVERRIDE;
	phy_write(phydev, MII_KSZPHY_OMSO, val);
	rc = ksz_config_flags(phydev);
	return rc < 0 ? rc : 0;
	}

	static int ks8051_config_init(struct phy_device *phydev)
	{
	int rc;

	rc = ksz_config_flags(phydev);
	return rc < 0 ? rc : 0;
	}

	static int ksz9021_load_values_from_of(struct phy_device *phydev,
	struct device_node *of_node, u16 reg,
	char field1, char field2,
	char field3, char field4)
	{
	int val1 = -1;
	int val2 = -2;
	int val3 = -3;
	int val4 = -4;
	int newval;
	int matches = 0;

	if (!of_property_read_u32(of_node, field1, &val1))
	matches++;

	if (!of_property_read_u32(of_node, field2, &val2))
	matches++;

	if (!of_property_read_u32(of_node, field3, &val3))
	matches++;

	if (!of_property_read_u32(of_node, field4, &val4))
	matches++;

	if (!matches)
	return 0;

	if (matches < 4)
	newval = kszphy_extended_read(phydev, reg);
	else
	newval = 0;

	if (val1 != -1)
	newval = ((newval & 0xfff0) \| ((val1 / PS_TO_REG) & 0xf) << 0);

	if (val2 != -1)
	newval = ((newval & 0xff0f) \| ((val2 / PS_TO_REG) & 0xf) << 4);

	if (val3 != -1)
	newval = ((newval & 0xf0ff) \| ((val3 / PS_TO_REG) & 0xf) << 8);

	if (val4 != -1)
	newval = ((newval & 0x0fff) \| ((val4 / PS_TO_REG) & 0xf) << 12);

	return kszphy_extended_write(phydev, reg, newval);
	}

	static int ksz9021_config_init(struct phy_device *phydev)
	{
	struct device *dev = &phydev->dev;
	struct device_node *of_node = dev->of_node;

	if (!of_node && dev->parent->of_node)
	of_node = dev->parent->of_node;

	if (of_node) {
	ksz9021_load_values_from_of(phydev, of_node,
	MII_KSZPHY_CLK_CONTROL_PAD_SKEW,
	"txen-skew-ps", "txc-skew-ps",
	"rxdv-skew-ps", "rxc-skew-ps");
	ksz9021_load_values_from_of(phydev, of_node,
	MII_KSZPHY_RX_DATA_PAD_SKEW,
	"rxd0-skew-ps", "rxd1-skew-ps",
	"rxd2-skew-ps", "rxd3-skew-ps");
	ksz9021_load_values_from_of(phydev, of_node,
	MII_KSZPHY_TX_DATA_PAD_SKEW,
	"txd0-skew-ps", "txd1-skew-ps",
	"txd2-skew-ps", "txd3-skew-ps");
	}
	return 0;
	}

	#define KSZ8873MLL_GLOBAL_CONTROL_4 0x06
	#define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX (1 << 6)
	#define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED (1 << 4)
	static int ksz8873mll_read_status(struct phy_device *phydev)
	{
	int regval;

	/* dummy read */
	regval = phy_read(phydev, KSZ8873MLL_GLOBAL_CONTROL_4);

	regval = phy_read(phydev, KSZ8873MLL_GLOBAL_CONTROL_4);

	if (regval & KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX)
	phydev->duplex = DUPLEX_HALF;
	else
	phydev->duplex = DUPLEX_FULL;

	if (regval & KSZ8873MLL_GLOBAL_CONTROL_4_SPEED)
	phydev->speed = SPEED_10;
	else
	phydev->speed = SPEED_100;

	phydev->link = 1;
	phydev->pause = phydev->asym_pause = 0;

	return 0;
	}

	static int ksz8873mll_config_aneg(struct phy_device *phydev)
	{
	return 0;
	}

	static struct phy_driver ksphy_driver[] = {
	{
	.phy_id = PHY_ID_KS8737,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KS8737",
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = ks8737_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8021,
	.phy_id_mask = 0x00ffffff,
	.name = "Micrel KSZ8021 or KSZ8031",
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause \|
	SUPPORTED_Asym_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = ksz8021_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8031,
	.phy_id_mask = 0x00ffffff,
	.name = "Micrel KSZ8031",
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause \|
	SUPPORTED_Asym_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = ksz8021_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8041,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KSZ8041",
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause
	\| SUPPORTED_Asym_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8041RNLI,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KSZ8041RNLI",
	.features = PHY_BASIC_FEATURES \|
	SUPPORTED_Pause \| SUPPORTED_Asym_Pause,
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8051,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KSZ8051",
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause
	\| SUPPORTED_Asym_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = ks8051_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8001,
	.name = "Micrel KSZ8001 or KS8721",
	.phy_id_mask = 0x00ffffff,
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8081,
	.name = "Micrel KSZ8081 or KSZ8091",
	.phy_id_mask = 0x00fffff0,
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ8061,
	.name = "Micrel KSZ8061",
	.phy_id_mask = 0x00fffff0,
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = kszphy_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE,},
	}, {
	.phy_id = PHY_ID_KSZ9021,
	.phy_id_mask = 0x000ffffe,
	.name = "Micrel KSZ9021 Gigabit PHY",
	.features = (PHY_GBIT_FEATURES \| SUPPORTED_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = ksz9021_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = ksz9021_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE, },
	}, {
	.phy_id = PHY_ID_KSZ9031,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KSZ9031 Gigabit PHY",
	.features = (PHY_GBIT_FEATURES \| SUPPORTED_Pause
	\| SUPPORTED_Asym_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.ack_interrupt = kszphy_ack_interrupt,
	.config_intr = ksz9021_config_intr,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE, },
	}, {
	.phy_id = PHY_ID_KSZ8873MLL,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KSZ8873MLL Switch",
	.features = (SUPPORTED_Pause \| SUPPORTED_Asym_Pause),
	.flags = PHY_HAS_MAGICANEG,
	.config_init = kszphy_config_init,
	.config_aneg = ksz8873mll_config_aneg,
	.read_status = ksz8873mll_read_status,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE, },
	}, {
	.phy_id = PHY_ID_KSZ886X,
	.phy_id_mask = 0x00fffff0,
	.name = "Micrel KSZ886X Switch",
	.features = (PHY_BASIC_FEATURES \| SUPPORTED_Pause),
	.flags = PHY_HAS_MAGICANEG \| PHY_HAS_INTERRUPT,
	.config_init = kszphy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.suspend = genphy_suspend,
	.resume = genphy_resume,
	.driver = { .owner = THIS_MODULE, },
	} };

	static int __init ksphy_init(void)
	{
	return phy_drivers_register(ksphy_driver,
	ARRAY_SIZE(ksphy_driver));
	}

	static void __exit ksphy_exit(void)
	{
	phy_drivers_unregister(ksphy_driver,
	ARRAY_SIZE(ksphy_driver));
	}

	module_init(ksphy_init);
	module_exit(ksphy_exit);

	MODULE_DESCRIPTION("Micrel PHY driver");
	MODULE_AUTHOR("David J. Choi");
	MODULE_LICENSE("GPL");

	static struct mdio_device_id __maybe_unused micrel_tbl[] = {
	{ PHY_ID_KSZ9021, 0x000ffffe },
	{ PHY_ID_KSZ9031, 0x00fffff0 },
	{ PHY_ID_KSZ8001, 0x00ffffff },
	{ PHY_ID_KS8737, 0x00fffff0 },
	{ PHY_ID_KSZ8021, 0x00ffffff },
	{ PHY_ID_KSZ8031, 0x00ffffff },
	{ PHY_ID_KSZ8041, 0x00fffff0 },
	{ PHY_ID_KSZ8051, 0x00fffff0 },
	{ PHY_ID_KSZ8061, 0x00fffff0 },
	{ PHY_ID_KSZ8081, 0x00fffff0 },
	{ PHY_ID_KSZ8873MLL, 0x00fffff0 },
	{ PHY_ID_KSZ886X, 0x00fffff0 },
	{ }
	};

	MODULE_DEVICE_TABLE(mdio, micrel_tbl);